•   +6(04) 398 1778
Humidity Control for Clean Rooms

Humidity Control for Clean Rooms

Clean Rooms are workplaces where contamination is controlled. The Clean Rooms are said to provide a conducive environment (for research, development and manufacturing of equipment or processes) with a low level of environmental pollutants such as dust, airborne microbes, aerosol particles, and chemical vapors.

With the growing emphasis on quality checks & controls, zero tolerance on defects and stringent manufacturing practices, the demand of clean rooms has increased manifold. The Clean rooms are now being designed as specially constructed enclosed areas, environmentally controlled with respect to airborne particles, temperature, humidity, air pressure flow patterns, air motion, vibration, noise and viable organisms.

Major application areas of clean rooms are in the electronic industry, pharmaceuticals, aerospace, automotive, information technology and many others requiring more stringent manufacturing conditions. The Clean Room applications range from the fabrication of microscopically small sub-assemblies, electronic devices and instruments, to the increasing demand for more sterility and purity in drugs, foods and a germ free atmosphere for medical and biological applications.

Contaminants can come from a wide variety of sources: air (the cleanliness of which is defined according to the classes of clean rooms and classes of dust), water, chemicals, the physical plant itself, and personnel.

Effects of Uncontrolled Humidity

  • Microbial growth and corrosion
  • Condensation on work surfaces resulting in delay in schedules and inferior product quality
  • Contamination leading to product spoilage

Causes of Uncontrolled Humidity

Examples of high humidity in Semiconductor and Pharmaceutical Clean Rooms

Semiconductor Clean Rooms
Microcircuits and microchips manufacturing requires hygroscopic polymers called photo resists to mask circuit lines for etching process. Because of their hygroscopic nature, they absorb moisture and, therefore, microscopic circuit lines are cut or bridged, resulting in circuit failures. In addition, in semiconductor manufacturing, when the humidity level fluctuates in a wafer fabrication area, a multitude of problems can occur. Bake-out times typically increase, and the entire process generally becomes harder to control. Humidity levels above 35% RH make the components vulnerable to corrosion. Additionally, as developer solvents are sprayed onto the wafer, the solvents evaporate rapidly, cooling the wafer enough to condense moisture from the air. This extra water can change the developer characteristics and be absorbed onto the semiconductor layers. This can cause swelling and further product quality problems, necessitating additional process control.

Pharmaceutical Clean Rooms
In Pharmaceutical manufacturing facilities, high humidity causes fine powders to absorb moisture, clogging the powder feed to the tableting press. Powder inconsistency caused by moisture absorption results in crumbling tablets and clogged tablet dies. Variation in humidity means difficult adjustments in bed temperature and spraying rates, resulting in heat damage and moisture intrusion. Also, humidity in air duct-work creates moist places for bacterial colonies to grow and causes process contamination.

General Recommendation
Relative Humidity in Clean Rooms should be controlled between 35-40% RH (this is a function of the process requirement) for year round operation. These RH levels are generally maintained in a narrow band ±2 % RH at temperatures below 20°C (70°F).

 Resources & Articles

CLIN ® "Resources" page is for individuals/companies seeking information on cleanrooms and controlled environments. Find Cleanroom News, Discussion Forums, Cleanroom Cleaning Recommendations, Cleanroom Terminology, Cleanroom Directory, and more.

 Content Disclaimer

Information are contributed by/from different websites and all credit goes to its respective owners/writers/websites/companies and etc, and while we endeavour to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.

In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of data or profits arising out of, or in connection with, the use of this website.

Through this website you are able to link to other websites which are not under the control of respective owners/writers/websites/companies and etc. We have no control over the nature, content and availability of those sites. The inclusion of any links does not necessarily imply a recommendation or endorse the views expressed within them.

Every effort is made to keep the website up and running smoothly. However, CLIN ® takes no responsibility for, and will not be liable for, the website being temporarily unavailable due to technical issues beyond our control.

We are experienced in Cleanroom Solutions

Call Us for Consultation +6(04) 398 1778

About CLIN

Cleanroom Industries Sdn. Bhd. was founded in 1999 as a pioneer manufacturer in Malaysia specializing in design and manufacture of a full range of cleanroom-related architectural products for cleanroom applications up to Class 1 cleanliness.

Awards & Recognitions

ISO 9001 Malaysia Power Brand Super Excellent Brand Sirim QAS Made in Malaysia Asia Pacific International Honesty Enterprise Keris Award